1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Polar Coordinates Arc Length

  1. Nov 10, 2008 #1
    1. The problem statement, all variables and given/known data

    Find The length of r=sin³(x/3) 0<x<3pi/2

    2. The attempt at a solution

    well first i found r'=3.cos(x/3).1/3.sin²(x/3)=cos(x/3)sin²(x/3)

    then i put the formula

    integral of radical (r'²+r²)dx and i'm stuck here

    any help?
  2. jcsd
  3. Nov 10, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi JosephR! :smile:

    Hint: sin6(x/3) = sin²(x/3)sin^4(x/3) :wink:
  4. Nov 10, 2008 #3
    hey tiny-tim:)

    i knew this but it would take some time to be solved !!

    because sin²(x/3)=[1-cos(2x/3)]/2

    anyway thanks buddy !!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Polar Coordinates Arc Length
  1. Polar arc length (Replies: 2)